AI Models Index tracks 178 releases with verified public release dates and...

https://blogfreely.net/samuel-wang09/did-gpt-6-sol-really-regress-compared-to-gpt-5-6-sol

AI Models Index tracks 178 releases with verified public release dates and blind-vote checks, so teams can compare model changes before upgrading. Results show 56% improved, helping you weigh likely gains against the risk of switching.